An ecological photoelectric decontamination treatment system and method

Abstract

The present application relates to a kind of ecological photoelectric decontamination treatment system and method, its system includes sedimentation separation tank for, suspended solids in wastewater or waste water is carried out sedimentation separation, obtain first water to be handled;Anaerobic filter tank is used for, under anaerobic condition, organic matter in first water to be handled is decomposed, metabolized and digested by anaerobic bacteria, obtain second water to be handled;Electrochemical treatment tank is used for, by electrolytic method, remove ammonia nitrogen and total phosphorus in second water to be handled, obtain third water to be handled;Sedimentation adjustment tank is used for, third water to be handled is carried out sedimentation separation, water quality regulation, water volume regulation and storage allocation, obtain fourth water to be handled;Disinfection tank is used for, fourth water to be handled is carried out disinfection treatment, obtain clean water;The present application combines anaerobic and photoelectrochemical treatment difficult biodegradation, toxic and harmful, high concentration, high chroma and ammonia nitrogen, phosphorus, COD waste water, after treatment, will not cause water body second pollution, form clean ecological treatment system.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an eco-friendly photoelectric pollution removal system and method. Background Technology

[0002] Currently, rural sewage treatment technology lags behind and suffers from a single model, hindering green development, ecological agriculture, and livable environments in rural areas. Ecological agriculture relies on good water sources, with crops and inland aquatic products entirely dependent on ecological freshwater. To achieve ecological agriculture, without adding any chemicals, causing secondary pollution, and meeting direct discharge standards for rivers, an ecological photoelectric integrated pollution removal device is used to eradicate six major sources of pollution in rural areas: First, domestic sewage from washing clothes and bathing, containing large amounts of phosphorus and nitrogen, which, when directly discharged, causes eutrophication and severely pollutes the rural water environment; second, kitchen sewage, which is relatively difficult to treat with traditional methods; third, toilet sewage, a breeding ground for pathogens; fourth, livestock wastewater, including wastewater from pig farms, cattle farms, fish ponds, and other livestock and aquaculture processes, containing high levels of chemical oxygen demand (COD), ammonia nitrogen, total phosphorus, heavy metals, and other pollutants; and sixth, pesticide and fertilizer pollution wastewater generated during planting and production.

[0003] Therefore, traditional wastewater treatment methods cannot remove ammonia nitrogen and total phosphorus from wastewater. Summary of the Invention

[0004] To address the technical problems of existing technologies failing to remove ammonia nitrogen and total phosphorus from wastewater, and the lack of application of new energy photoelectric chemical treatment methods combining wastewater treatment with photovoltaics and AC-to-DC conversion, this invention provides an ecological photoelectric pollution removal system and method that combines anaerobic and photoelectric chemical treatment to treat wastewater that is difficult to biodegrade, toxic, harmful, high in concentration, high in color, and contains ammonia nitrogen, phosphorus, and COD, without causing secondary pollution to the water body.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0006] An eco-friendly photoelectric pollution removal system includes a sedimentation separation tank, an anaerobic filtration tank, an electrochemical treatment tank, a sedimentation conditioning tank, and a disinfection tank.

[0007] The sedimentation separation tank is used to separate suspended solids in sewage or wastewater to obtain a first water to be treated; the anaerobic filtration tank is used to decompose organic matter in the first water to be treated into compounds through anaerobic bacteria decomposition, metabolism and digestion under anaerobic conditions, so as to reduce the organic load in the first water to be treated and obtain a second water to be treated.

[0008] The electrochemical treatment cell is used to remove ammonia nitrogen and total phosphorus from the second water to be treated by electrolysis to obtain the third water to be treated.

[0009] The sedimentation and conditioning tank is used to perform sedimentation separation, water quality conditioning, water quantity conditioning, and storage and distribution of the third water to be treated, so as to obtain the fourth water to be treated.

[0010] The disinfection tank is used to disinfect the fourth water to be treated to obtain clean water;

[0011] The electrochemical treatment cell includes a water tank and multiple positive electrodes disposed in the water tank and multiple negative electrodes corresponding to the multiple positive electrodes. The positive electrodes and the negative electrodes are made of iron-carbon alloy. Each positive electrode and each negative electrode is a needle-shaped electrode rod with a cylindrical structure. Each positive electrode is parallel to the corresponding negative electrode.

[0012] The water tank is used to store the second water to be treated;

[0013] By applying a high-frequency DC pulse voltage to each of the positive and corresponding negative electrodes, an electrolytic current is passed through the second water to be treated, and ammonia nitrogen and total phosphorus in the second water to be treated are removed under the action of the electrolytic current; wherein, during the process of applying a high-frequency DC pulse voltage to each of the positive and negative electrodes, all the positive and negative electrodes rotate, and the rotation directions of each positive electrode and the corresponding negative electrode are the same or opposite.

[0014] A photovoltaic power generation device is installed on the electrochemical treatment cell, and the photovoltaic power generation device is electrically connected to a plurality of positive electrodes and a plurality of negative electrodes of the electrochemical treatment cell.

[0015] The photovoltaic power generation device is used to provide the high-frequency DC pulse voltage to the plurality of positive electrodes and the plurality of negative electrodes through photovoltaic power generation.

[0016] The beneficial effects of this invention are: It removes nitrate and nitrite nitrogen from water using electrochemical reduction, and removes ammonia nitrogen from water using electrochemical oxidation; electrochemical phosphorus removal uses an iron-carbon alloy as the positive electrode, where ferrous and ferric ions generated during electrolysis react with phosphate ions in wastewater to form ferrous phosphate or ferric phosphate precipitates; some ferric ions react with OH- ions generated during electrolysis within different pH ranges. -The ionic reaction generates iron hydroxyl compounds, ferrous hydroxide, and ferric hydroxide precipitates, while phosphate ions are adsorbed on the surface and removed along with the precipitates and particulate matter. Simultaneously, the negative electrode generates hydrogen gas, resulting in flotation, which causes particulate matter in the solution to float to the surface and be removed. The combination of anaerobic decomposition and photoelectric electrolytic chemical treatment utilizes electrochemical electrolysis to achieve nitrogen and phosphorus reduction, flotation, flocculation, disinfection, decolorization, deodorization, and separation, thereby reducing the total phosphorus, total nitrogen, and COD content of wastewater, lowering treatment costs, and meeting discharge standards. This invention addresses several drawbacks of current wastewater treatment methods, including chemical, biological, and membrane osmosis methods. Chemical methods leave chemical residues; biological methods have long treatment times; and membrane osmosis methods have high investment costs. The invention primarily employs an electrochemical wastewater treatment method. An electrochemical reaction occurs at the electrodes, utilizing safe low-voltage direct current. Wastewater is electrolyzed using direct current pulses at a specific frequency and current density without the addition of any chemicals. The electrochemical process is safe, reliable, and free of side effects, resulting in harmless degradation without secondary pollution. The electrochemical reaction can be carried out at relatively low temperatures, requiring minimal space and operating under mild conditions. Extensive on-site earthwork is unnecessary, saving initial investment, shortening treatment time, and offering a simple, practical, and low-cost process.

[0017] Based on the above technical solution, the present invention can be further improved as follows.

[0018] Furthermore, the photovoltaic power generation device includes an electronic controller, a high-frequency DC pulse generator, a rectifier, a boost converter, a photovoltaic module, and a battery; the positive output terminal of the high-frequency DC pulse generator is electrically connected to multiple positive terminals, and the negative output terminal of the high-frequency DC pulse generator is electrically connected to multiple negative terminals; the input terminal of the electronic controller is electrically connected to the electrodes of the battery, the boost converter, and the output terminal of the rectifier, respectively; the output terminal of the electronic controller is electrically connected to the input terminal of the high-frequency DC pulse generator; the input terminal of the boost converter is electrically connected to the output terminal of the photovoltaic module; and the electrodes of the battery are electrically connected to the output terminal of the boost converter.

[0019] The photovoltaic module is used to convert light energy into electrical energy to output an initial DC voltage;

[0020] The boost converter is used to boost the initial DC voltage to obtain a first DC voltage;

[0021] The battery is used to store the first DC voltage;

[0022] The rectifier is used to convert AC mains power into a second DC voltage;

[0023] The electronic controller is used to control the on / off connection between the high-frequency DC pulse generator and the boost converter;

[0024] The electronic controller is also used to control the connection and disconnection between the high-frequency DC pulse generator and the battery;

[0025] The electronic controller is also used to control the on / off connection between the high-frequency DC pulse generator and the rectifier;

[0026] A high-frequency DC pulse generator is used to convert the first DC voltage or the second DC voltage into the high-frequency DC pulse voltage, and to provide the high-frequency DC pulse voltage to the plurality of positive terminals and the plurality of negative terminals.

[0027] Furthermore, the magnitude range of the high-frequency DC pulse voltage is 24V-36V, the frequency range of the high-frequency DC pulse voltage is 10KHz-50KHz, and the current density range of the electrolysis current in the second water to be treated is 30A / m. 2 -100A / m 2 .

[0028] Furthermore, the diameter of the needle-shaped electrode rod ranges from 0.2cm to 0.6cm.

[0029] Furthermore, the water tank is also equipped with multiple positive grids and multiple negative grids that correspond one-to-one with the multiple positive grids;

[0030] Each of the positive electrode grids is provided with a plurality of positive electrodes and a plurality of rotation control devices corresponding one to one of the positive electrodes. Each positive electrode and the positive electrode grid are rotatably connected through the corresponding rotation control device.

[0031] Each of the negative electrode grids is provided with a plurality of negative electrodes and a plurality of rotation control devices corresponding to the plurality of negative electrodes. Each negative electrode and the negative electrode grid are rotatably connected through the corresponding rotation control device.

[0032] The rotation control device located on the positive electrode grid is used to drive the positive electrode to rotate;

[0033] The rotation control device located on the negative electrode grid is used to drive the negative electrode to rotate.

[0034] Furthermore, any two positive electrodes on the same positive electrode grid are parallel to each other, and any two negative electrodes on the same negative electrode grid are parallel to each other; the positive electrode on the positive electrode grid and the corresponding negative electrode on the negative electrode grid are parallel to each other.

[0035] Furthermore, multiple positive electrodes on the same positive electrode grid are arranged in multiple rows and columns, and the spacing between two adjacent positive electrodes in the same row is 3mm-5mm; multiple negative electrodes on the same negative electrode grid are arranged in multiple rows and columns, and the spacing between two adjacent negative electrodes in the same row is 3mm-5mm.

[0036] The positive electrode in any row of the positive electrode grid is located between two adjacent negative electrodes in the corresponding negative electrode grid; the spacing between any row of the positive electrode and the adjacent row of the negative electrode is 5mm-10mm.

[0037] Furthermore, the rotation control device includes a motor and a coupling, the motor shaft is fixedly connected to the positive or negative pole through the coupling, and the motor is fixedly connected to the positive or negative pole grid.

[0038] Furthermore, it also includes a slurry filtration device, a mud thickening device, and a mud dewatering device;

[0039] The slurry filtration device is used to filter the sludge in the initial sludge in the anaerobic filtration tank and the sludge in the secondary sludge in the sedimentation and conditioning tank to obtain sludge slurry.

[0040] The mud thickening device is used to thicken the sludge slurry to reduce its moisture content;

[0041] The mud dewatering device is used to dewater the sludge slurry that has been concentrated by the mud thickening device, so as to obtain dewatered mud slurry that can be used to produce organic fertilizer.

[0042] To address the aforementioned technical problems, this invention also provides an eco-friendly photoelectric pollution removal method, the specific technical details of which are as follows:

[0043] An eco-friendly photoelectric pollution removal method includes the following steps:

[0044] Suspended solids in sewage or wastewater are separated by sedimentation in a sedimentation tank to obtain the first batch of water to be treated.

[0045] Under anaerobic conditions, anaerobic bacteria decompose, metabolize, and digest the organic matter in the first water to be treated into compounds, thereby reducing the organic load in the first water to be treated and obtaining the second water to be treated.

[0046] Ammonia nitrogen and total phosphorus in the second water to be treated are removed by electrolysis in an electrochemical treatment cell to obtain the third water to be treated.

[0047] The third water to be treated is subjected to sedimentation separation, water quality adjustment, water quantity adjustment, and storage and distribution in a sedimentation and equalization tank to obtain the fourth water to be treated.

[0048] The fourth type of water to be treated is disinfected using a disinfection tank to obtain clean water;

[0049] The electrochemical treatment tank includes a water tank and multiple positive electrodes and multiple negative electrodes corresponding to each positive electrode, all disposed within the water tank. Both the positive and negative electrodes are made of iron-carbon alloy, and each positive and negative electrode is a cylindrical needle-shaped electrode rod, with each positive electrode parallel to its corresponding negative electrode. The water tank stores the second water to be treated. A photovoltaic power generation device is installed on the electrochemical treatment tank, and the photovoltaic power generation device is electrically connected to the multiple positive and negative electrodes of the electrochemical treatment tank. During the application of a high-frequency DC pulse voltage to each positive and negative electrode, all positive and negative electrodes rotate, and the rotation directions of each positive electrode and its corresponding negative electrode are either the same or opposite.

[0050] The ammonia nitrogen and total phosphorus in the second water to be treated are removed by electrolysis in an electrochemical treatment cell to obtain the third water to be treated. The specific steps include the following:

[0051] The photovoltaic power generation device provides the high-frequency DC pulse voltage to the multiple positive electrodes and the multiple negative electrodes through photovoltaic power generation;

[0052] By connecting the high-frequency DC pulse voltage to each of the positive and corresponding negative electrodes, an electrolytic current is allowed to pass through the second water to be treated, and ammonia nitrogen and total phosphorus in the second water to be treated are removed under the action of the electrolytic current. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of an eco-friendly photoelectric pollution removal system according to an embodiment of the present invention;

[0054] Figure 2 This is a schematic diagram of the electrochemical treatment cell in an embodiment of the present invention;

[0055] Figure 3 This is a schematic diagram of the installation structure of the positive or negative electrode in an embodiment of the present invention;

[0056] Figure 4 This is a flowchart illustrating an eco-friendly photoelectric pollution removal method according to an embodiment of the present invention.

[0057] The attached diagram lists the components represented by each number as follows:

[0058] 1-Sedimentation separation tank, 2-Anaerobic filtration tank, 3-Electrochemical treatment tank, 4-Electrical controller, 5-Boost converter, 6-Photovoltaic module, 7-Storage battery, 8-Sedimentation conditioning tank, 9-Disinfection tank, 10-Floating body, 11-Positive electrode, 12-Negative electrode, 13-Slurry filtration device, 14-Slurry thickening device, 15-Slurry dewatering device, 16-High frequency DC pulse generator, 17-Rectifier, 18-Positive electrode bar screen, 19-Negative electrode bar screen, 20-Motor, 21-Coupling. Detailed Implementation

[0059] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0060] like Figure 1 As shown, this embodiment provides an ecological photoelectric pollution removal system, including a sedimentation separation tank 1, an anaerobic filtration tank 2, an electrochemical treatment tank 3, a sedimentation conditioning tank 8, and a disinfection tank 9. The sedimentation separation tank 1 is used to separate suspended solids in sewage or wastewater by sedimentation to obtain a first water to be treated. The anaerobic filtration tank 2 is used to decompose organic matter in the first water to be treated into compounds through decomposition, metabolism, and digestion by anaerobic bacteria under anaerobic conditions, thereby reducing the organic load in the first water to be treated to obtain a second water to be treated. The electrochemical treatment tank 3 is used to remove ammonia nitrogen and total phosphorus from the second water to be treated by electrolysis to obtain a third water to be treated. The sedimentation conditioning tank 8 is used to perform sedimentation separation, water quality conditioning, water quantity conditioning, and storage and distribution on the third water to be treated to obtain a fourth water to be treated. The disinfection tank 9 is used to disinfect the fourth water to be treated to obtain clean water.

[0061] The electrochemical treatment tank 3 includes a water tank and multiple positive electrodes 11 and multiple negative electrodes 12 corresponding to each of the positive electrodes 11, all disposed within the water tank. The positive electrodes 11 and negative electrodes 12 are made of iron-carbon alloy, and each positive electrode 11 and each negative electrode 12 is a cylindrical needle-shaped electrode rod, with each positive electrode 11 parallel to its corresponding negative electrode 12. The water tank stores the second water to be treated. A photovoltaic power generation device is installed on the electrochemical treatment tank 3, and the photovoltaic power generation device is electrically connected to the multiple positive electrodes 11 and the multiple negative electrodes 12 of the electrochemical treatment tank 3. When a high-frequency DC pulse voltage is applied to each positive electrode 11 and each negative electrode 12, all positive electrodes 11 and all negative electrodes 12 rotate, and the rotation directions of each positive electrode 11 and its corresponding negative electrode 12 are the same or opposite. Rotating the positive electrodes 11 and their corresponding negative electrodes 12 improves the efficiency of the electrochemical reaction, thus improving the wastewater treatment efficiency.

[0062] The photovoltaic power generation device is used to provide the high-frequency DC pulse voltage to the plurality of positive electrodes 11 and the plurality of negative electrodes 12 through photovoltaic power generation; by connecting the high-frequency DC pulse voltage to each positive electrode 11 and the corresponding negative electrode 12, an electrolytic current is allowed to pass through the second water to be treated, and ammonia nitrogen and total phosphorus in the second water to be treated are removed under the action of the electrolytic current. Its specific phosphorus removal chemical formula is as follows:

[0063] Fe→Fe 2+ +2e - ;

[0064] Fe 3+ +PO4 3- →FePO4↓;

[0065] 3Fe 2+ +2PO4 3- →Fe3(PO4)2↓;

[0066] The chemical formula for nitrogen removal or denitrification is as follows:

[0067] NO3 - +10H + +8e - →NH4 + +3H2O;

[0068] NO3 - +2H + +2e - →NO2 - +H2O;

[0069] NO3 - +6H + +5e - →N2+3H2O.

[0070] like Figure 2 As shown, the photovoltaic power generation device includes an electronic controller 4, a high-frequency DC pulse generator 16, a rectifier 17, a boost converter 5, a photovoltaic module 6, and a battery 7. The positive output terminal of the high-frequency DC pulse generator 16 is electrically connected to multiple positive terminals 11, and the negative output terminal of the high-frequency DC pulse generator 16 is electrically connected to multiple negative terminals 12. The input terminal of the electronic controller 4 is electrically connected to the electrodes of the battery 7, the boost converter 5, and the output terminal of the rectifier 17, respectively. The output terminal of the electronic controller 4 is electrically connected to the input terminal of the high-frequency DC pulse generator 16. The input terminal of the boost converter 5 is electrically connected to the output terminal of the photovoltaic module 6, and the electrodes of the battery 7 are electrically connected to the output terminal of the boost converter 5.

[0071] The photovoltaic module 6 is used to convert light energy into electrical energy to output an initial DC voltage; the boost converter 5 is used to boost the initial DC voltage to obtain a first DC voltage; the battery 7 is used to store the first DC voltage; the rectifier 17 is used to convert AC mains power into a second DC voltage; the electronic controller 4 is used to control the on / off connection between the high-frequency DC pulse generator 16 and the boost converter 5; the electronic controller 4 is also used to control the on / off connection between the high-frequency DC pulse generator 16 and the battery 7; the electronic controller 4 is also used to control the on / off connection between the high-frequency DC pulse generator 16 and the rectifier 17; the high-frequency DC pulse generator 16 is used to convert the first DC voltage or the second DC voltage into the high-frequency DC pulse voltage, and to provide the high-frequency DC pulse voltage to the plurality of positive electrodes 11 and the plurality of negative electrodes 12.

[0072] The high-frequency DC pulse generator 16 is used to convert the alternating current into the high-frequency DC pulse voltage and provide the high-frequency DC pulse voltage to the plurality of positive electrodes 11 and the plurality of negative electrodes 12. In a specific configuration, a float 10 can be set in the water tank, allowing the float 10 to float on the second water to be treated in the water tank. The electronic controller 4, the boost converter 5, the photovoltaic module 6, the high-frequency DC pulse generator 16, the rectifier 17, and the battery 7 are all fixed to the upper end of the float 10, and the plurality of positive electrodes 11 and the plurality of negative electrodes 12 are fixedly set at the lower end of the water tank.

[0073] In some embodiments, the magnitude of the high-frequency DC pulse voltage is in the range of 24V-36V, the frequency range of the high-frequency DC pulse voltage is 10KHz-50KHz, and the current density of the electrolysis current in the second water to be treated is in the range of 30A / m. 2 -100A / m 2 The diameter of the needle-shaped electrode rod ranges from 0.2cm to 0.6cm. Preferably, the diameter of the needle-shaped electrode rod is 4cm.

[0074] The water tank is also provided with a plurality of positive grids 18 and a plurality of negative grids 19 corresponding to the positive grids 18; each positive grid 18 is provided with a plurality of positive electrodes 11 and a plurality of rotation control devices corresponding to the plurality of positive electrodes 11, and each positive electrode 11 is rotatably connected to the positive grid 18 through the corresponding rotation control device.

[0075] Each negative electrode grid 19 is provided with a plurality of negative electrodes 12 and a plurality of rotation control devices corresponding to the plurality of negative electrodes 12. Each negative electrode 12 is rotatably connected to the negative electrode grid 19 through the corresponding rotation control device. The rotation control device located on the positive electrode grid 18 is used to drive the positive electrode 11 to rotate. The rotation control device located on the negative electrode grid 19 is used to drive the negative electrode 12 to rotate.

[0076] Wherein, any two positive electrodes 11 on the same positive electrode grid 18 are parallel to each other, and any two negative electrodes 12 on the same negative electrode grid 19 are parallel to each other; the positive electrode 11 on the positive electrode grid 18 and the corresponding negative electrode 12 on the negative electrode grid 19 are parallel to each other.

[0077] Specifically, multiple positive electrodes 11 on the same positive electrode grid 18 are arranged in multiple rows and columns, with the spacing between two adjacent positive electrodes 11 in the same row ranging from 3mm to 5mm; multiple negative electrodes 12 on the same negative electrode grid 19 are arranged in multiple rows and columns, with the spacing between two adjacent negative electrodes 12 in the same row ranging from 3mm to 5mm; any row of positive electrodes 11 on the positive electrode grid 18 is located between two adjacent rows of negative electrodes 12 on the corresponding negative electrode grid 19; the spacing between any row of positive electrodes 11 and the adjacent row of negative electrodes 12 ranges from 5mm to 10mm. The row-and-column arrangement of positive and negative electrodes can form a dense and uniform electric field network in the wastewater after energization, further improving the electrochemical reaction efficiency and thus improving wastewater treatment efficiency.

[0078] like Figure 3 As shown, the rotation control device includes a motor 20 and a coupling 21. The shaft of the motor 20 is fixedly connected to the positive electrode 11 on the positive electrode grid 18 via the coupling 21, and the motor 20 is fixedly connected to the positive electrode grid 18 with screws. The shaft of the motor 20 is fixedly connected to the negative electrode 12 on the negative electrode grid 19 via the coupling 21, and the motor 20 is fixedly connected to the negative electrode grid 19 with screws. Both the positive electrode 11 and the negative electrode 12 rotate under the drive of their respective motors 20.

[0079] In some other embodiments, the eco-friendly photoelectric pollution treatment system further includes a slurry filtration device 13, a slurry thickening device 14, and a slurry dewatering device 15; the slurry filtration device 13 is used to filter the sludge in the initial sludge in the anaerobic filtration tank 2 and the sludge in the secondary sludge in the sedimentation and conditioning tank 8 to obtain sludge slurry; the slurry thickening device 14 is used to thicken the sludge slurry to reduce its moisture content; the slurry dewatering device 15 is used to dewater the sludge slurry after it has been thickened by the slurry thickening device 14 to obtain dewatered sludge for the production of organic fertilizer.

[0080] This embodiment removes nitrate and nitrite nitrogen from water using electrochemical reduction and removes ammonia nitrogen using electrochemical oxidation. Electrochemical phosphorus removal uses an iron-carbon alloy as the positive electrode; during electrolysis, ferrous and ferric ions react with phosphate ions in the wastewater to form ferrous phosphate or ferric phosphate precipitates. Some ferric ions react with OH- ions generated during electrolysis within different pH ranges. - The ionic reaction generates iron hydroxyl compounds, ferrous hydroxide, and ferric hydroxide precipitates, while phosphate ions are adsorbed on the surface and removed along with the precipitates and particulate matter. Simultaneously, the negative electrode generates hydrogen gas, resulting in flotation, which causes particulate matter in the solution to float to the surface and be removed. The combination of anaerobic decomposition and photoelectric electrolytic chemical treatment utilizes electrochemical electrolysis to achieve nitrogen and phosphorus reduction, flotation, flocculation, disinfection, decolorization, deodorization, and separation, thereby reducing the total phosphorus, total nitrogen, and COD content of wastewater, lowering treatment costs, and meeting discharge standards. This invention addresses several drawbacks of current wastewater treatment methods, including chemical, biological, and membrane osmosis methods. Chemical methods leave chemical residues; biological methods have long treatment times; and membrane osmosis methods have high investment costs. The invention primarily employs an electrochemical wastewater treatment method. An electrochemical reaction occurs at the electrodes, utilizing safe low-voltage direct current. Wastewater is electrolyzed using direct current pulses at a specific frequency and current density without the addition of any chemicals. The electrochemical process is safe, reliable, and free of side effects, resulting in harmless degradation without secondary pollution. The electrochemical reaction can be carried out at relatively low temperatures, requiring minimal space and operating under mild conditions. Extensive on-site earthwork is unnecessary, saving initial investment, shortening treatment time, and offering a simple, practical, and low-cost process.

[0081] like Figure 4 As shown, in some embodiments, an eco-friendly photoelectric pollution removal method is also provided, including the following steps:

[0082] S1. Use sedimentation separation tank 1 to separate suspended solids in sewage or wastewater to obtain the first water to be treated.

[0083] S2. Using anaerobic filtration tank 2 under anaerobic conditions, anaerobic bacteria decompose, metabolize, and digest the organic matter in the first water to be treated into compounds, thereby reducing the organic load in the first water to be treated and obtaining the second water to be treated.

[0084] S3. Using electrochemical treatment cell 3, ammonia nitrogen and total phosphorus in the second water to be treated are removed by electrolysis to obtain the third water to be treated.

[0085] Specifically, the electrochemical treatment tank 3 includes a water tank and multiple positive electrodes 11 and multiple negative electrodes 12 corresponding to each of the positive electrodes 11, all disposed within the water tank. The positive electrodes 11 and negative electrodes 12 are made of iron-carbon alloy, and each positive electrode 11 and each negative electrode 12 is a cylindrical needle-shaped electrode rod, with each positive electrode 11 parallel to its corresponding negative electrode 12. The water tank is used to store the second water to be treated. A photovoltaic power generation device is installed on the electrochemical treatment tank 3, and the photovoltaic power generation device is electrically connected to the multiple positive electrodes 11 and the multiple negative electrodes 12 of the electrochemical treatment tank 3. During the process of applying a high-frequency DC pulse voltage to each positive electrode 11 and each negative electrode 12, all positive electrodes 11 and all negative electrodes 12 rotate, and the rotation directions of each positive electrode 11 and its corresponding negative electrode 12 are the same or opposite.

[0086] The ammonia nitrogen and total phosphorus in the second water to be treated are removed by electrolysis in electrochemical treatment cell 3 to obtain the third water to be treated. The specific steps include the following:

[0087] The photovoltaic power generation device provides the high-frequency DC pulse voltage to the plurality of positive electrodes 11 and the plurality of negative electrodes 12 through photovoltaic power generation;

[0088] By connecting the high-frequency DC pulse voltage to each of the positive electrodes 11 and the corresponding negative electrodes 12, an electrolytic current is allowed to pass through the second water to be treated, and ammonia nitrogen and total phosphorus in the second water to be treated are removed under the action of the electrolytic current.

[0089] The high-frequency DC pulse generator is connected to a DC power supply via multiple parallel positive electrode grids 11 and multiple parallel negative electrode grids 12 in the electrochemical treatment tank 3, forming an unloaded circuit. This allows a low-voltage DC pulse current to pass through the second water to be treated. Under the action of the high-frequency DC pulse electrolysis current at a certain oscillation frequency and current density, an online electrochemical reaction is generated on the electrodes to form free radicals that decompose toxic and harmful substances in the water, thereby achieving wastewater treatment. Under the action of the high-frequency pulse electric field, the positive electrode grids 11 and negative electrode grids 12 react with the wastewater to produce an oxidation-reduction reaction. During the oxidation-reduction process, phosphorus and nitrogen removal are achieved through different reaction equations to achieve harmless degradation, removing ammonia nitrogen, total phosphorus, and COD from the second water to be treated, thus obtaining the third water to be treated.

[0090] The photovoltaic power generation device includes an electronic controller 4, a high-frequency DC pulse generator 16, a rectifier 17, a boost converter 5, a photovoltaic module 6, and a battery 7. The positive output terminal of the high-frequency DC pulse generator 16 is electrically connected to multiple positive terminals 11, and the negative output terminal of the high-frequency DC pulse generator 16 is electrically connected to multiple negative terminals 12. The input terminal of the electronic controller 4 is electrically connected to the electrodes of the battery 7, the boost converter 5, and the output terminal of the rectifier 17, respectively. The output terminal of the electronic controller 4 is electrically connected to the input terminal of the high-frequency DC pulse generator 16. The input terminal of the boost converter 5 is electrically connected to the output terminal of the photovoltaic module 6, and the electrodes of the battery 7 are electrically connected to the output terminal of the boost converter 5.

[0091] The photovoltaic module 6 is used to convert light energy into electrical energy to output an initial DC voltage; the boost converter 5 is used to boost the initial DC voltage to obtain a first DC voltage; the battery 7 is used to store the first DC voltage; the rectifier 17 is used to convert AC mains power into a second DC voltage; the electronic controller 4 is used to control the on / off connection between the high-frequency DC pulse generator 16 and the boost converter 5; the electronic controller 4 is also used to control the on / off connection between the high-frequency DC pulse generator 16 and the battery 7; the electronic controller 4 is also used to control the on / off connection between the high-frequency DC pulse generator 16 and the rectifier 17; the high-frequency DC pulse generator 16 is used to convert the first DC voltage or the second DC voltage into the high-frequency DC pulse voltage, and to provide the high-frequency DC pulse voltage to the plurality of positive electrodes 11 and the plurality of negative electrodes 12.

[0092] Specifically, the photovoltaic power generation device provides DC power to the plurality of positive electrodes 11 and the plurality of negative electrodes 12 through photovoltaic power generation, including the following steps:

[0093] S301. The photovoltaic module 6 is used to convert light energy into electrical energy to output an initial DC voltage;

[0094] S302. The initial DC voltage is boosted using the boost converter 5 to obtain a first DC voltage;

[0095] S303. The first DC voltage is stored using the storage battery 7;

[0096] S304. The AC mains power is converted into a second DC voltage using the rectifier 17.

[0097] S305. The electronic controller 4 controls the switching between the high-frequency DC pulse generator 16 and the boost converter 5; controls the switching between the high-frequency DC pulse generator 16 and the battery 7; and controls the switching between the high-frequency DC pulse generator 16 and the rectifier 17.

[0098] S306. The first DC voltage or the second DC voltage is converted into the high-frequency DC pulse voltage using a high-frequency DC pulse generator 16, and the high-frequency DC pulse voltage is provided to the plurality of positive terminals 11 and the plurality of negative terminals 12.

[0099] S4. Use sedimentation and equalization tank 8 to separate the suspended solids in the third water to be treated by sedimentation, and obtain the fourth water to be treated.

[0100] The process includes the following steps after the suspended solids in the third water to be treated are separated by sedimentation in the sedimentation and equalization tank 8 to obtain the fourth water to be treated:

[0101] S401. Use slurry filtration device 13 to filter the sludge in the initial sludge in the anaerobic filter tank 2 and the sludge in the secondary sludge in the sedimentation and equalization tank 8 to obtain sludge slurry.

[0102] S402. The sludge slurry is concentrated using the sludge thickening device 14 to reduce the moisture content of the sludge slurry;

[0103] S403. The sludge slurry concentrated by the sludge thickening device 14 is dewatered using the sludge dewatering device 15 to obtain dewatered sludge for the production of organic fertilizer.

[0104] S5. The fourth water to be treated is disinfected using disinfection tank 9 to obtain clean water. The specific disinfection method can be ultraviolet disinfection.

[0105] In some embodiments, 0.1 ton of wastewater is placed into the electrochemical treatment tank 3. A 24V high-frequency DC pulse voltage with a frequency of 30kHz is connected to the positive and negative electrodes, generating a pulsed electric field between the parallel-interleaved positive and negative electrodes, with an output current of 30A. After a 20-minute reaction, the total phosphorus decreases from 0.78 mg / L to 0.4 mg / L, and the total nitrogen decreases from 4.65 mg / L to 2 mg / L. This meets the Class V water quality standard of the "Surface Water Environmental Quality Standard (GB3838-2002)".

[0106] In some other embodiments, 0.1 ton of wastewater was placed into the electrochemical treatment tank 3. A 24V high-frequency DC pulse voltage with a frequency of 30kHz was connected to the positive and negative electrodes, generating a pulsed electric field between the parallel-interleaved positive and negative electrodes, with an output current of 30A. After a 20-minute reaction, the total phosphorus decreased from 0.78 mg / L to 0.4 mg / L, and the total nitrogen decreased from 4.65 mg / L to 2 mg / L. This met the Class V water quality standard of the "Surface Water Environmental Quality Standard (GB3838-2002)".

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An eco-friendly photoelectric pollution removal system, characterized in that, It includes a sedimentation separation tank (1), an anaerobic filtration tank (2), an electrochemical treatment tank (3), a sedimentation conditioning tank (8), and a disinfection tank (9); The sedimentation separation tank (1) is used to separate suspended solids in sewage or wastewater by sedimentation to obtain the first water to be treated; the anaerobic filtration tank (2) is used to decompose the organic matter in the first water to be treated into compounds by anaerobic bacteria through decomposition, metabolism and digestion under anaerobic conditions, so as to reduce the organic load in the first water to be treated and obtain the second water to be treated. The electrochemical treatment tank (3) is used to remove ammonia nitrogen and total phosphorus from the second water to be treated by electrolysis to obtain the third water to be treated; The sedimentation and conditioning tank (8) is used to perform sedimentation separation, water quality conditioning, water quantity conditioning and storage and distribution of the third water to be treated, so as to obtain the fourth water to be treated. The disinfection tank (9) is used to disinfect the fourth water to be treated to obtain clean water; The electrochemical treatment cell (3) includes a water tank and multiple positive electrodes (11) disposed in the water tank and multiple negative electrodes (12) corresponding to the multiple positive electrodes (11). The positive electrodes (11) and the negative electrodes (12) are made of iron-carbon alloy. Each positive electrode (11) and each negative electrode (12) is a needle-shaped electrode rod with a cylindrical structure. Each positive electrode (11) is parallel to the corresponding negative electrode (12). The water tank is used to store the second water to be treated; By applying a high-frequency DC pulse voltage to each of the positive electrodes (11) and the corresponding negative electrodes (12), an electrolytic current is allowed to pass through the second water to be treated, and ammonia nitrogen and total phosphorus in the second water to be treated are removed under the action of the electrolytic current; wherein, during the process of applying a high-frequency DC pulse voltage to each of the positive electrodes (11) and each of the negative electrodes (12), all the positive electrodes (11) and all the negative electrodes (12) rotate, and the rotation directions of each positive electrode (11) and the corresponding negative electrode (12) are the same or opposite; A photovoltaic power generation device is provided on the electrochemical treatment cell (3), and the photovoltaic power generation device is electrically connected to the multiple positive electrodes (11) and multiple negative electrodes (12) of the electrochemical treatment cell (3). The photovoltaic power generation device is used to provide the high-frequency DC pulse voltage to the plurality of positive electrodes (11) and the plurality of negative electrodes (12) through photovoltaic power generation; The water tank is also equipped with multiple positive grids (18) and multiple negative grids (19) that correspond one-to-one with the multiple positive grids (18). Each of the positive electrode grids (18) is provided with a plurality of positive electrodes (11) and a plurality of rotation control devices corresponding to the plurality of positive electrodes (11). Each positive electrode (11) is rotatably connected to the positive electrode grid (18) through the corresponding rotation control device. Each negative electrode grid (19) is provided with a plurality of negative electrodes (12) and a plurality of rotation control devices corresponding to the plurality of negative electrodes (12). Each negative electrode (12) is rotatably connected to the negative electrode grid (19) through the corresponding rotation control device. The rotation control device located on the positive electrode grid (18) is used to drive the positive electrode (11) to rotate; The rotation control device located on the negative electrode grid (19) is used to drive the negative electrode (12) to rotate.

2. The eco-friendly photoelectric pollution removal system according to claim 1, characterized in that, The photovoltaic power generation device includes an electronic controller (4), a high-frequency DC pulse generator (16), a rectifier (17), a boost converter (5), a photovoltaic module (6), and a storage battery (7); the positive output terminal of the high-frequency DC pulse generator (16) is electrically connected to multiple positive terminals (11), and the negative output terminal of the high-frequency DC pulse generator (16) is electrically connected to multiple negative terminals (12); the input terminal of the electronic controller (4) is electrically connected to the electrodes of the storage battery (7), the boost converter (5), and the output terminal of the rectifier (17), respectively; the output terminal of the electronic controller (4) is electrically connected to the input terminal of the high-frequency DC pulse generator (16); the input terminal of the boost converter (5) is electrically connected to the output terminal of the photovoltaic module (6); and the electrodes of the storage battery (7) are electrically connected to the output terminal of the boost converter (5). The photovoltaic module (6) is used to convert light energy into electrical energy to output an initial DC voltage; The boost converter (5) is used to boost the initial DC voltage to obtain a first DC voltage; The battery (7) is used to store the first DC voltage; The rectifier (17) is used to convert AC mains power into a second DC voltage; The electronic controller (4) is used to control the on / off connection between the high-frequency DC pulse generator (16) and the boost converter (5); The electronic controller (4) is also used to control the connection and disconnection between the high-frequency DC pulse generator (16) and the battery (7); The electronic controller (4) is also used to control the on / off connection between the high-frequency DC pulse generator (16) and the rectifier (17); A high-frequency DC pulse generator (16) is used to convert the first DC voltage or the second DC voltage into the high-frequency DC pulse voltage and to provide the high-frequency DC pulse voltage to the plurality of positive terminals (11) and the plurality of negative terminals (12).

3. The eco-friendly photoelectric pollution removal system according to claim 1, characterized in that, The high-frequency DC pulse voltage has a magnitude range of 24V-36V and a frequency range of 10kHz-50kHz. The electrolysis current density in the second water to be treated has a magnitude range of 30A / m³. -100A / .

4. The eco-friendly photoelectric pollution removal system according to claim 1, characterized in that, The diameter of the needle-shaped electrode rod ranges from 0.2cm to 0.6cm.

5. The eco-friendly photoelectric pollution removal system according to claim 1, characterized in that, Any two positive electrodes (11) on the same positive electrode grid (18) are parallel to each other, and any two negative electrodes (12) on the same negative electrode grid (19) are parallel to each other; the positive electrode (11) on the positive electrode grid (18) and the corresponding negative electrode (12) on the negative electrode grid (19) are parallel to each other.

6. The eco-friendly photoelectric pollution removal system according to claim 5, characterized in that, Multiple positive electrodes (11) on the same positive electrode grid (18) are arranged in multiple rows and columns, and the spacing between two adjacent positive electrodes (11) in the same row is 3mm-5mm; multiple negative electrodes (12) on the same negative electrode grid (19) are arranged in multiple rows and columns, and the spacing between two adjacent negative electrodes (12) in the same row is 3mm-5mm. The positive electrode (11) in any row of the positive electrode grid (18) is located between two adjacent negative electrodes (12) in the corresponding negative electrode grid (19); the spacing between any row of the positive electrode (11) and the adjacent row of the negative electrode (12) is 5mm-10mm.

7. The eco-friendly photoelectric pollution removal system according to claim 1, characterized in that, The rotation control device includes a motor (20) and a coupling (21). The rotating shaft of the motor (20) is fixedly connected to the positive pole (11) or the negative pole (12) through the coupling (21). The motor (20) is fixedly connected to the positive pole grid (18) or the negative pole grid (19).

8. An eco-friendly photoelectric pollution removal system according to any one of claims 1 to 7, characterized in that, It also includes a slurry filtration device (13), a mud thickening device (14), and a mud dewatering device (15). The slurry filtration device (13) is used to filter the sludge in the initial sludge in the anaerobic filtration tank (2) and the sludge in the secondary sludge in the sedimentation and conditioning tank (8) to obtain sludge slurry; The mud thickening device (14) is used to thicken the sludge slurry to reduce the moisture content of the sludge slurry; The mud dewatering device (15) is used to dewater the sludge slurry after it has been concentrated by the mud thickening device (14) to obtain dewatered sludge for the production of organic fertilizer.

9. An eco-friendly photoelectric pollution removal method, characterized in that, Includes the following steps: The suspended solids in the sewage or wastewater are separated by sedimentation separation tank (1) to obtain the first water to be treated; Using an anaerobic filter (2) under anaerobic conditions, the organic matter in the first water to be treated is decomposed into compounds by anaerobic bacteria through decomposition, metabolism and digestion, so as to reduce the organic load in the first water to be treated and obtain the second water to be treated. Ammonia nitrogen and total phosphorus in the second water to be treated are removed by electrolysis using an electrochemical treatment cell (3) to obtain the third water to be treated; The third water to be treated is subjected to sedimentation separation, water quality adjustment, water quantity adjustment and storage and distribution in the sedimentation and equalization tank (8) to obtain the fourth water to be treated; The fourth water to be treated is disinfected using a disinfection tank (9) to obtain clean water; The electrochemical treatment tank (3) includes a water tank and multiple positive electrodes (11) and multiple negative electrodes (12) corresponding to the multiple positive electrodes (11) in the water tank. The positive electrodes (11) and the negative electrodes (12) are made of iron-carbon alloy. Each positive electrode (11) and each negative electrode (12) is a needle-shaped electrode rod with a cylindrical structure. Each positive electrode (11) is parallel to the corresponding negative electrode (12). The water tank is used to store the second water to be treated. A photovoltaic power generation device is provided on the electrochemical treatment tank (3). The photovoltaic power generation device is electrically connected to the multiple positive electrodes (11) and the multiple negative electrodes (12) of the electrochemical treatment tank (3). During the process of each positive electrode (11) and each negative electrode (12) being connected to a high-frequency DC pulse voltage, all the positive electrodes (11) and all the negative electrodes (12) rotate. The rotation directions of each positive electrode (11) and the corresponding negative electrode (12) are the same or opposite. The ammonia nitrogen and total phosphorus in the second water to be treated are removed by electrolysis using an electrochemical treatment cell (3) to obtain the third water to be treated. The specific steps include the following: The photovoltaic power generation device provides the high-frequency DC pulse voltage to the plurality of positive electrodes (11) and the plurality of negative electrodes (12) through photovoltaic power generation; By connecting the high-frequency DC pulse voltage to each of the positive electrodes (11) and the corresponding negative electrodes (12), an electrolytic current is allowed to pass through the second water to be treated, and ammonia nitrogen and total phosphorus in the second water to be treated are removed under the action of the electrolytic current; The water tank is also equipped with multiple positive grids (18) and multiple negative grids (19) that correspond one-to-one with the multiple positive grids (18). Each of the positive electrode grids (18) is provided with a plurality of positive electrodes (11) and a plurality of rotation control devices corresponding to the plurality of positive electrodes (11). Each positive electrode (11) is rotatably connected to the positive electrode grid (18) through the corresponding rotation control device. Each negative electrode grid (19) is provided with a plurality of negative electrodes (12) and a plurality of rotation control devices corresponding to the plurality of negative electrodes (12). Each negative electrode (12) is rotatably connected to the negative electrode grid (19) through the corresponding rotation control device. The rotation control device located on the positive electrode grid (18) is used to drive the positive electrode (11) to rotate; The rotation control device located on the negative electrode grid (19) is used to drive the negative electrode (12) to rotate.

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